sys/arch/alpha/pci/irongate_dma.c

   1 /* $NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2000 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Jason R. Thorpe.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * DMA support for the AMD 751 (``Irongate'') core logic chipset.
  34  *
  35  * The AMD 751 is really unlike all of the other Alpha PCI core logic
  36  * chipsets.  Instead, it looks like a normal PC chipset (not surprising,
  37  * since it is used for Athlon processors).
  38  *
  39  * Because of this, it lacks all of the SGMAP hardware normally present
  40  * on an Alpha system, and there are no DMA windows.  Instead, a memory
  41  * bus address is a PCI DMA address, and ISA DMA above 16M has to be
  42  * bounced (this is not unlike the Jensen, actually).
  43  */
  44
  45 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  46
  47 __KERNEL_RCSID(0, "$NetBSD: irongate_dma.c,v 1.3 2000/06/29 08:58:47 mrg Exp $");
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/kernel.h>
  52 #include <sys/device.h>
  53 #include <sys/malloc.h>
  54
  55 #include <uvm/uvm_extern.h>
  56
  57 #define _ALPHA_BUS_DMA_PRIVATE
  58 #include <machine/bus.h>
  59
  60 #include <dev/pci/pcireg.h>
  61 #include <dev/pci/pcivar.h>
  62
  63 #include <alpha/pci/irongatereg.h>
  64 #include <alpha/pci/irongatevar.h>
  65
  66 #include <dev/isa/isareg.h>
  67 #include <dev/isa/isavar.h>
  68
  69 bus_dma_tag_t irongate_dma_get_tag(bus_dma_tag_t, alpha_bus_t);
  70
  71 void
  72 irongate_dma_init(struct irongate_config *icp)
  73 {
  74         bus_dma_tag_t t;
  75
  76         /*
  77          * Initialize the DMA tag used for PCI DMA.
  78          */
  79         t = &icp->ic_dmat_pci;
  80         t->_cookie = icp;
  81         t->_wbase = 0;
  82         t->_wsize = 0x100000000UL;
  83         t->_next_window = NULL;
  84         t->_boundary = 0;
  85         t->_sgmap = NULL;
  86         t->_get_tag = irongate_dma_get_tag;
  87         t->_dmamap_create = _bus_dmamap_create;
  88         t->_dmamap_destroy = _bus_dmamap_destroy;
  89         t->_dmamap_load = _bus_dmamap_load_direct;
  90         t->_dmamap_load_mbuf = _bus_dmamap_load_mbuf_direct;
  91         t->_dmamap_load_uio = _bus_dmamap_load_uio_direct;
  92         t->_dmamap_load_raw = _bus_dmamap_load_raw_direct;
  93         t->_dmamap_unload = _bus_dmamap_unload;
  94         t->_dmamap_sync = _bus_dmamap_sync;
  95
  96         t->_dmamem_alloc = _bus_dmamem_alloc;
  97         t->_dmamem_free = _bus_dmamem_free;
  98         t->_dmamem_map = _bus_dmamem_map;
  99         t->_dmamem_unmap = _bus_dmamem_unmap;
 100         t->_dmamem_mmap = _bus_dmamem_mmap;
 101
 102         /*
 103          * Initialize the DMA tag used for ISA DMA.
 104          */
 105         t = &icp->ic_dmat_isa;
 106         t->_cookie = icp;
 107         t->_wbase = 0;
 108         t->_wsize = 0x1000000;
 109         t->_next_window = NULL;
 110         t->_boundary = 0;
 111         t->_sgmap = NULL;
 112         t->_get_tag = irongate_dma_get_tag;
 113         t->_dmamap_create = isadma_bounce_dmamap_create;
 114         t->_dmamap_destroy = isadma_bounce_dmamap_destroy;
 115         t->_dmamap_load = isadma_bounce_dmamap_load;
 116         t->_dmamap_load_mbuf = isadma_bounce_dmamap_load_mbuf;
 117         t->_dmamap_load_uio = isadma_bounce_dmamap_load_uio;
 118         t->_dmamap_load_raw = isadma_bounce_dmamap_load_raw;
 119         t->_dmamap_unload = isadma_bounce_dmamap_unload;
 120         t->_dmamap_sync = isadma_bounce_dmamap_sync;
 121
 122         t->_dmamem_alloc = isadma_bounce_dmamem_alloc;
 123         t->_dmamem_free = _bus_dmamem_free;
 124         t->_dmamem_map = _bus_dmamem_map;
 125         t->_dmamem_unmap = _bus_dmamem_unmap;
 126         t->_dmamem_mmap = _bus_dmamem_mmap;
 127
 128         /* XXX XXX BEGIN XXX XXX */
 129         {                                                       /* XXX */
 130                 extern paddr_t alpha_XXX_dmamap_or;             /* XXX */
 131                 alpha_XXX_dmamap_or = 0;                        /* XXX */
 132         }                                                       /* XXX */
 133         /* XXX XXX END XXX XXX */
 134 }
 135
 136 /*
 137  * Return the bus dma tag to be used for the specified bus type.
 138  * INTERNAL USE ONLY!
 139  */
 140 bus_dma_tag_t
 141 irongate_dma_get_tag(bus_dma_tag_t t, alpha_bus_t bustype)
 142 {
 143         struct irongate_config *icp = t->_cookie;
 144
 145         switch (bustype) {
 146         case ALPHA_BUS_PCI:
 147         case ALPHA_BUS_EISA:
 148                 /*
 149                  * Busses capable of 32-bit DMA get the PCI DMA tag.
 150                  */
 151                 return (&icp->ic_dmat_pci);
 152
 153         case ALPHA_BUS_ISA:
 154                 /*
 155                  * Lame 24-bit busses have to bounce.
 156                  */
 157                 return (&icp->ic_dmat_isa);
 158
 159         default:
 160                 panic("irongate_dma_get_tag: shouldn't be here, really...");
 161         }
 162 }